Q. A cat moves from $X$ to $Y$ with a uniform speed $v_{u}$and returns to$\ $X with a uniform speed $v_{d}$. The average speed for this ground trip is
A) $- \frac{2v_{d}v_{u}}{v_{d} + v_{u}}$
B) $\sqrt{v_{u}v_{d}}$
C) $\frac{v_{d}v_{u}}{v_{d} + v_{u}}$
D) $\frac{v_{u}{+ v}_{d}}{2}$
Explanation
(a) Average speed $= \frac{2v_{d}v_{u}}{v_{d} + v_{u}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.